IL2RA and type 1 diabetes mellitus: For T1D susceptibility, two associations are known to exist at IL2RA. In a large-scale fine-mapping study of over 300 SNPs in the IL2RA-RBM17 region in our T1D collection, we localized the association to T1D susceptibility to two groups of SNPs located in the 5′ region and intron 1 of IL2RA; any one or more SNPs from each group could potentially be the causal variant(s) [8].